Unit-Conversion-Chart

Unit conversion is refers to conversion factors between different units of measurement for the same quantity.

Area Conversion

From	To	Value
millimetre (mm)	metre (m)	1E-3
centimetre (cm)	m	1E-2
kilometre (km)	m	1E3
inch (in)	m	2.54E-2
foot (ft)	m	3.048E-1 (12 in)
yard (yd)	m	0.9144 exactly (3 ft)
fathom	m	1.8288 (2 yd)
chain	m	2.01168E1 (22 yd)
furlong	m	2.01168E2 (10 chains, 220 yd)
cable - not precisely defined, 608ft (1/10 UK nautical mile) or 720 ft (120 fathoms)
mile	m	1.609344E3 (1760 yd)
nautical mile (UK)	m	1.853184E3 (6080 ft)
nautical mile (international) (n mile)	m	1.852E3
league - not precisely defined, about 3 miles
astronomic(al) unit (AU)	m	1.49597870E11
light year (l.y.)	m	9.4607E15
parsec (pc)	m	3.0857E16

Constants
a0	Bohr radius (bohrradius)
alpha	reciprocal fine structure constant
amu	atomic mass unit
au	astronomical unit
c	speed of light in vacuum
e	elementary charge
epsilon	permittivity of vacuum (permittivity)
faraday	Faraday constant
force	acceleration of gravity
gammae	electron gyromagnetic ratio
gammap	proton gyromagnetic ratio (in water)
ge	electron Lande factor (g value)
gH	proton Lande factor
grav	acceleration of gravity (same as force)
Grav	gravitational constant (gravity)
h	Planck constant (planckconstant)
hartree	atomic energy unit
hbar	h/2 pi (hquer)
k	Boltzmann constant (boltzmannconstant)
lambdac	Compton wavelength (comptonwavelength)
me	electron rest mass (electronmass)
mn	neutron rest mass (neutronmass)
mp	proton rest mass (protonmass)
mole	equal to Avogadro's number (pure number!)
Mol	same as mole
mu	permeability of vacuum (permeability)
muB	Bohr magneton (mub, bohrmagneton)
mun	nuclear magneton (muN, nuclearmagneton)
NA	Avogadro's number (unit /mol)
nue	electron Larmor frequency factor
nup	proton Larmor frequency factor
pi	3.14159... (Ludolf's number)
R	gas constant
Vmol	molar volume